<?php

namespace App\Services\Backoffice;

use App\Models\UserSalesVolume;
use App\User;

/**
 * Persönliche Monatsstatistik eines Beraters: nachvollziehbare Auflistung der
 * Punkte/Umsätze des Monats, gruppiert nach eigenen Bestellungen, Shop-Bestellungen
 * und Abos.
 *
 * Im Gegensatz zur Team-Statistik ({@see BackofficeDashboardService}) werden hier die
 * einzelnen `user_sales_volumes`-Zeilen (per-Zeile `points`/`total_net`) des Users selbst
 * gruppiert – nicht die kumulativen month_*-Snapshots.
 */
class PersonalStatisticsService
{
    /**
     * @return array{
     *     month: int,
     *     year: int,
     *     totals: array{own_points: float, shop_points: float, abo_points: float, other_points: float, total_points: float, turnover_net: float},
     *     groups: array<string, array{key: string, label: string, points: float, net: float, rows: array<int, array<string, mixed>>}>
     * }
     */
    public function monthly(User $user, int $month, int $year): array
    {
        $volumes = UserSalesVolume::query()
            ->with(['shopping_order.shopping_user'])
            ->where('user_id', $user->id)
            ->where('month', $month)
            ->where('year', $year)
            ->orderBy('id')
            ->get();

        $groups = [
            'own' => $this->emptyGroup('own', 'Eigene Bestellungen'),
            'shop' => $this->emptyGroup('shop', 'Shop-Bestellungen'),
            'abo' => $this->emptyGroup('abo', 'Abos'),
            'other' => $this->emptyGroup('other', 'Sonstige'),
        ];

        foreach ($volumes as $volume) {
            $key = $this->groupKey($volume);
            $groups[$key]['rows'][] = $this->mapRow($volume);
            $groups[$key]['points'] += (float) $volume->points;
            $groups[$key]['net'] += (float) $volume->total_net;
        }

        $totals = [
            'own_points' => $groups['own']['points'],
            'shop_points' => $groups['shop']['points'],
            'abo_points' => $groups['abo']['points'],
            'other_points' => $groups['other']['points'],
            'total_points' => $groups['own']['points'] + $groups['shop']['points'] + $groups['abo']['points'] + $groups['other']['points'],
            'turnover_net' => $groups['own']['net'] + $groups['shop']['net'] + $groups['abo']['net'] + $groups['other']['net'],
        ];

        return [
            'month' => $month,
            'year' => $year,
            'totals' => $totals,
            'groups' => $groups,
        ];
    }

    private function groupKey(UserSalesVolume $volume): string
    {
        $status = (int) $volume->status;
        $order = $volume->shopping_order;

        if ($status === 1) {
            return 'own';
        }

        if ($status === 2 && $order) {
            return $order->is_abo ? 'abo' : 'shop';
        }

        return 'other';
    }

    /**
     * @return array{key: string, label: string, points: float, net: float, rows: array<int, array<string, mixed>>}
     */
    private function emptyGroup(string $key, string $label): array
    {
        return [
            'key' => $key,
            'label' => $label,
            'points' => 0.0,
            'net' => 0.0,
            'rows' => [],
        ];
    }

    /**
     * @return array<string, mixed>
     */
    private function mapRow(UserSalesVolume $volume): array
    {
        $order = $volume->shopping_order;
        $customer = $order?->shopping_user;

        return [
            'date' => $volume->date,
            'points' => (float) $volume->points,
            'total_net' => (float) $volume->total_net,
            'status' => (int) $volume->status,
            'status_label' => $volume->getStatusType(),
            'status_color' => $volume->getStatusColor(),
            'order_id' => $order?->id,
            'order_type' => $order ? ((int) $volume->status === 1 ? 'own' : 'shop') : null,
            'customer_name' => $customer ? trim(($customer->billing_firstname ?? '').' '.($customer->billing_lastname ?? '')) : null,
            'customer_email' => $customer?->billing_email,
            'info' => $volume->info,
            'message' => $volume->message,
        ];
    }
}